505186985 has 4 divisors (see below), whose sum is σ = 606224388. Its totient is φ = 404149584.

The previous prime is 505186921. The next prime is 505187003. The reversal of 505186985 is 589681505.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 334597264 + 170589721 = 18292^2 + 13061^2 .

It is a cyclic number.

It is not a de Polignac number, because 505186985 - 2⁶ = 505186921 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50518694 + ... + 50518703.

It is an arithmetic number, because the mean of its divisors is an integer number (151556097).

Almost surely, 2^505186985 is an apocalyptic number.

It is an amenable number.

505186985 is a deficient number, since it is larger than the sum of its proper divisors (101037403).

505186985 is a wasteful number, since it uses less digits than its factorization.

505186985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101037402.

The product of its (nonzero) digits is 432000, while the sum is 47.

The square root of 505186985 is about 22476.3650308496. The cubic root of 505186985 is about 796.4356979605.

The spelling of 505186985 in words is "five hundred five million, one hundred eighty-six thousand, nine hundred eighty-five".